<template>
  <div class="book-management">
    <h1>图书管理系统</h1>
    
    <el-button type="primary" @click="showAddDialog">添加图书</el-button>
    
    <el-table 
      :data="books" 
      style="width: 100%" 
      border
      v-loading="loading"
    >
      <el-table-column prop="id" label="ID" width="80" sortable></el-table-column>
      <el-table-column prop="title" label="书名"></el-table-column>
      <el-table-column prop="author" label="作者"></el-table-column>
      <el-table-column prop="copies" label="库存数量" sortable></el-table-column>
      <el-table-column label="操作" width="180">
        <template slot-scope="scope">
          <el-button
            size="mini"
            type="danger"
            @click="handleDelete(scope.row.id)">删除</el-button>
        </template>
      </el-table-column>
    </el-table>
    
    <el-dialog 
      title="添加图书" 
      :visible.sync="dialogVisible" 
      width="30%"
      @closed="resetForm"
    >
      <el-form 
        :model="form" 
        :rules="rules" 
        ref="bookForm" 
        label-width="80px"
      >
        <el-form-item label="书名" prop="title">
          <el-input v-model="form.title"></el-input>
        </el-form-item>
        <el-form-item label="作者" prop="author">
          <el-input v-model="form.author"></el-input>
        </el-form-item>
        <el-form-item label="库存" prop="copies">
          <el-input-number v-model="form.copies" :min="1"></el-input-number>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitForm">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'BookManagement',
  data() {
    return {
      books: [
        {"id": 1, "title": "Python 编程", "author": "John Doe", "copies": 4},
        {"id": 2, "title": "历史的秘密", "author": "Jane Smith", "copies": 3},
        {"id": 3, "title": "宇宙探索", "author": "Emily Brown", "copies": 2},
        {"id": 4, "title": "健康生活", "author": "Mike Johnson", "copies": 5},
        {"id": 5, "title": "数学之美", "author": "Sarah Lee", "copies": 4},
        {"id": 6, "title": "艺术欣赏", "author": "David White", "copies": 3},
        {"id": 7, "title": "编程入门", "author": "Alice Green", "copies": 2},
        {"id": 8, "title": "科幻世界", "author": "Frank Black", "copies": 5},
        {"id": 9, "title": "自然奇观", "author": "Grace Blue", "copies": 4},
        {"id": 10, "title": "音乐之声", "author": "Tom Red", "copies": 3}
      ],
      loading: false,
      dialogVisible: false,
      form: {
        title: '',
        author: '',
        copies: 1
      },
      rules: {
        title: [
          { required: true, message: '请输入书名', trigger: 'blur' },
          { min: 2, max: 50, message: '长度在 2 到 50 个字符', trigger: 'blur' }
        ],
        author: [
          { required: true, message: '请输入作者', trigger: 'blur' },
          { min: 2, max: 20, message: '长度在 2 到 20 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    showAddDialog() {
      this.dialogVisible = true
    },
    submitForm() {
      this.$refs.bookForm.validate((valid) => {
        if (valid) {
          this.addBook()
        }
      })
    },
    addBook() {
      // 生成新ID
      const newId = this.books.length > 0 
        ? Math.max(...this.books.map(book => book.id)) + 1 
        : 1
      
      this.books.push({
        id: newId,
        title: this.form.title,
        author: this.form.author,
        copies: this.form.copies
      })
      
      this.$message.success('图书添加成功')
      this.dialogVisible = false
    },
    handleDelete(id) {
      this.$confirm('确认删除该图书吗?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        this.books = this.books.filter(book => book.id !== id)
        this.$message.success('删除成功')
      }).catch(() => {
        this.$message.info('已取消删除')         
      })
    },
    resetForm() {
      this.$refs.bookForm.resetFields()
    }
  }
}
</script>

<style scoped>
.book-management {
  padding: 20px;
}
h1 {
  margin-bottom: 20px;
}
.el-button {
  margin-bottom: 20px;
}
</style>